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Kerotan said:

This is the improvement that will make PS4 RAM a lot cheaper among other improvements.

http://www.bit-tech.net/news/hardware/2015/01/15/samsung-gddr5-ps4/1

can't find a link for the reason xbox's ddr3 is going to get more expensive but the reason was due to the expected decline in demand for it as the industry is moving on from it. less demand equals higher costs to make and less money 

DDR4 RAM is around the corner. When new RAM technology becomes the standard, the price of the previous generation RAM goes up (and quite significantly, too). When DDR3 became the standard, the price of DDR2 went up. GDDR5 RAM, in contrast, does not have this problem.